'Damage' in the Bible

Then I heard something like a voice from among the four living creatures saying, "A quart of wheat will cost a day's pay and three quarts of barley will cost a day's pay. But do not damage the olive oil and the wine!"

Then I saw another angel ascending from the east, who had the seal of the living God. He shouted out with a loud voice to the four angels who had been given permission to damage the earth and the sea:

"Do not damage the earth or the sea or the trees until we have put a seal on the foreheads of the servants of our God."

They were told not to damage the grass of the earth, or any green plant or tree, but only those people who did not have the seal of God on their forehead.